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#include <iostream>
#include <cmath>
using namespace std;
 
template<class T>
T f(T x, T y) {
	return x < y ? x : y;
}
 
int main() {
	{
	double x = (double)5;
	cout << x << endl;
	}
	{
	double x = f(1.5, 3);
	cout << x << endl;
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:16:21: error: no matching function for call to ‘f(double, int)’
  double x = f(1.5, 3);
                     ^
prog.cpp:6:3: note: candidate: ‘template<class T> T f(T, T)’
 T f(T x, T y) {
   ^
prog.cpp:6:3: note:   template argument deduction/substitution failed:
prog.cpp:16:21: note:   deduced conflicting types for parameter ‘T’ (‘double’ and ‘int’)
  double x = f(1.5, 3);
                     ^

Standard output is empty